Astro::FITS::HdrTrans::SCUBA - JCMT SCUBA translations
Converts information contained in SCUBA FITS headers to and from generic headers. See Astro::FITS::HdrTrans for a list of generic headers.
The name of the instrument required to match (case insensitively) against the INSTRUME/INSTRUMENT keyword to allow this class to translate the specified headers.
Called by the default
$inst = $class->this_instrument();
The database tables do not include an instrument field so we need to determine suitability by looking at other fields instead of using the base implementation.
$cando = $class->can_translate( \%hdrs );
For SCUBA we first check for BOLOMS and SCU# headers and then use the base implementation that will look at the INSTRUME field.
These methods are more complicated than a simple mapping. We have to provide both from- and to-FITS conversions All these routines are methods and the to_ routines all take a reference to a hash and return the translated value (a many-to-one mapping) The from_ methods take a reference to a generic hash and return a translated hash (sometimes these are many-to-many)
CHOP_CRD FITS header to determine the chopper coordinate system, and then places that coordinate type in the
CHOP_COORDINATE_SYSTEM generic header.
A FITS header value of 'LO' translates to 'Tracking', 'AZ' translates to 'Alt/Az', and 'NA' translates to 'Focal Plane'. Any other values will return undef.
CENT_CRD FITS header to determine the coordinate type (galactic, B1950, J2000) and then places that coordinate type in the
COORDINATE_TYPE generic header.
Translates EQUINOX header into valid equinox value. The following translation is done:
EQUINOX values into SCUBA FITS equinox values for the
photometry if the FITS header value for
PHOTOM, otherwise returns
Converts the observation type. If the FITS header is equal to
POLMAP, then the generic header value is
OBJECT. Else, the FITS header value is copied directly to the generic header value.
POLARIMETRY generic header to 'true' if the value for the FITS header
MODE is 'POLMAP' or 'POLPHOT', otherwise sets it to 'false'.
Converts either the
DATE header into a
Converts UT date in
Time::Piece object into
YYYY:MM:DD format for
UTSTART into a unified
UTSTART generic header. If those headers do not exist, uses
Converts the unified
UTSTART generic header into
UTSTART FITS headers of the form
Converts the <UTDATE> and
UTEND headers into a combined
Converts the unified
UTEND generic header into
UTEND FITS headers of the form
Converts the MSBID field to an MSBID. Complication is that the SCUBA header and database store a blank MSBID as a single space rather than an empty string and this causes difficulty in some subsystems.
This routine replaces a single space with a null string.
Brad Cavanagh <firstname.lastname@example.org>, Tim Jenness <email@example.com>
Copyright (C) 2007 Science and Technology Facilities Council. Copyright (C) 2003-2005 Particle Physics and Astronomy Research Council. All Rights Reserved.
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